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org.apache.poi.util</FONT>
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Class IOUtils</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.poi.util.IOUtils</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>IOUtils</B><DT>extends java.lang.Object</DL>
</PRE>

<P>
<HR>

<P>

<!-- ========== METHOD SUMMARY =========== -->

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<CODE>static&nbsp;long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#calculateChecksum(byte[])">calculateChecksum</A></B>(byte[]&nbsp;data)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Calculate checksum on input data</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#calculateChecksum(java.io.InputStream)">calculateChecksum</A></B>(java.io.InputStream&nbsp;stream)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Calculate checksum on all the data read from input stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#closeQuietly(java.io.Closeable)">closeQuietly</A></B>(java.io.Closeable&nbsp;closeable)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Quietly (no exceptions) close Closable resource.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#copy(java.io.InputStream, java.io.OutputStream)">copy</A></B>(java.io.InputStream&nbsp;inp,
     java.io.OutputStream&nbsp;out)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Copies all the data from the given InputStream to the OutputStream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#peekFirst8Bytes(java.io.InputStream)">peekFirst8Bytes</A></B>(java.io.InputStream&nbsp;stream)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Peeks at the first 8 bytes of the stream.</TD>
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<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#readFully(java.io.InputStream, byte[])">readFully</A></B>(java.io.InputStream&nbsp;in,
          byte[]&nbsp;b)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Helper method, just calls <tt>readFully(in, b, 0, b.length)</tt></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#readFully(java.io.InputStream, byte[], int, int)">readFully</A></B>(java.io.InputStream&nbsp;in,
          byte[]&nbsp;b,
          int&nbsp;off,
          int&nbsp;len)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Same as the normal <tt>in.read(b, off, len)</tt>, but tries to ensure
 that the entire len number of bytes is read.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#readFully(java.nio.channels.ReadableByteChannel, java.nio.ByteBuffer)">readFully</A></B>(java.nio.channels.ReadableByteChannel&nbsp;channel,
          java.nio.ByteBuffer&nbsp;b)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Same as the normal <tt>channel.read(b)</tt>, but tries to ensure
 that the buffer is filled completely if possible, i.e.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#toByteArray(java.nio.ByteBuffer, int)">toByteArray</A></B>(java.nio.ByteBuffer&nbsp;buffer,
            int&nbsp;length)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an array (that shouldn't be written to!) of the
  ByteBuffer.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#toByteArray(java.io.InputStream)">toByteArray</A></B>(java.io.InputStream&nbsp;stream)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads all the data from the input stream, and returns the bytes read.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/poi/util/IOUtils.html#toByteArray(java.io.InputStream, int)">toByteArray</A></B>(java.io.InputStream&nbsp;stream,
            int&nbsp;length)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads up to <code>length</code> bytes from the input stream, and returns the bytes read.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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&nbsp;
<P>

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<A NAME="peekFirst8Bytes(java.io.InputStream)"><!-- --></A><H3>
peekFirst8Bytes</H3>
<PRE>
public static byte[] <B>peekFirst8Bytes</B>(java.io.InputStream&nbsp;stream)
                              throws java.io.IOException,
                                     <A HREF="../../../../org/apache/poi/EmptyFileException.html" title="class in org.apache.poi">EmptyFileException</A></PRE>
<DL>
<DD>Peeks at the first 8 bytes of the stream. Returns those bytes, but
  with the stream unaffected. Requires a stream that supports mark/reset,
  or a PushbackInputStream. If the stream has &gt;0 but &lt;8 bytes, 
  remaining bytes will be zero.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/apache/poi/EmptyFileException.html" title="class in org.apache.poi">EmptyFileException</A></CODE> - if the stream is empty
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="toByteArray(java.io.InputStream)"><!-- --></A><H3>
toByteArray</H3>
<PRE>
public static byte[] <B>toByteArray</B>(java.io.InputStream&nbsp;stream)
                          throws java.io.IOException</PRE>
<DL>
<DD>Reads all the data from the input stream, and returns the bytes read.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="toByteArray(java.io.InputStream, int)"><!-- --></A><H3>
toByteArray</H3>
<PRE>
public static byte[] <B>toByteArray</B>(java.io.InputStream&nbsp;stream,
                                 int&nbsp;length)
                          throws java.io.IOException</PRE>
<DL>
<DD>Reads up to <code>length</code> bytes from the input stream, and returns the bytes read.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="toByteArray(java.nio.ByteBuffer, int)"><!-- --></A><H3>
toByteArray</H3>
<PRE>
public static byte[] <B>toByteArray</B>(java.nio.ByteBuffer&nbsp;buffer,
                                 int&nbsp;length)</PRE>
<DL>
<DD>Returns an array (that shouldn't be written to!) of the
  ByteBuffer. Will be of the requested length, or possibly
  longer if that's easier.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="readFully(java.io.InputStream, byte[])"><!-- --></A><H3>
readFully</H3>
<PRE>
public static int <B>readFully</B>(java.io.InputStream&nbsp;in,
                            byte[]&nbsp;b)
                     throws java.io.IOException</PRE>
<DL>
<DD>Helper method, just calls <tt>readFully(in, b, 0, b.length)</tt>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="readFully(java.io.InputStream, byte[], int, int)"><!-- --></A><H3>
readFully</H3>
<PRE>
public static int <B>readFully</B>(java.io.InputStream&nbsp;in,
                            byte[]&nbsp;b,
                            int&nbsp;off,
                            int&nbsp;len)
                     throws java.io.IOException</PRE>
<DL>
<DD>Same as the normal <tt>in.read(b, off, len)</tt>, but tries to ensure
 that the entire len number of bytes is read.
 <p>
 If the end of file is reached before any bytes are read, returns -1. If
 the end of the file is reached after some bytes are read, returns the
 number of bytes read. If the end of the file isn't reached before len
 bytes have been read, will return len bytes.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="readFully(java.nio.channels.ReadableByteChannel, java.nio.ByteBuffer)"><!-- --></A><H3>
readFully</H3>
<PRE>
public static int <B>readFully</B>(java.nio.channels.ReadableByteChannel&nbsp;channel,
                            java.nio.ByteBuffer&nbsp;b)
                     throws java.io.IOException</PRE>
<DL>
<DD>Same as the normal <tt>channel.read(b)</tt>, but tries to ensure
 that the buffer is filled completely if possible, i.e. b.remaining()
 returns 0.
 <p>
 If the end of file is reached before any bytes are read, returns -1. If
 the end of the file is reached after some bytes are read, returns the
 number of bytes read. If the end of the file isn't reached before the
 buffer has no more remaining capacity, will return the number of bytes
 that were read.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="copy(java.io.InputStream, java.io.OutputStream)"><!-- --></A><H3>
copy</H3>
<PRE>
public static void <B>copy</B>(java.io.InputStream&nbsp;inp,
                        java.io.OutputStream&nbsp;out)
                 throws java.io.IOException</PRE>
<DL>
<DD>Copies all the data from the given InputStream to the OutputStream. It
 leaves both streams open, so you will still need to close them once done.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="calculateChecksum(byte[])"><!-- --></A><H3>
calculateChecksum</H3>
<PRE>
public static long <B>calculateChecksum</B>(byte[]&nbsp;data)</PRE>
<DL>
<DD>Calculate checksum on input data
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="calculateChecksum(java.io.InputStream)"><!-- --></A><H3>
calculateChecksum</H3>
<PRE>
public static long <B>calculateChecksum</B>(java.io.InputStream&nbsp;stream)
                              throws java.io.IOException</PRE>
<DL>
<DD>Calculate checksum on all the data read from input stream.

 This should be more efficient than the equivalent code
 <code>IOUtils.calculateChecksum(IOUtils.toByteArray(stream))</code>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="closeQuietly(java.io.Closeable)"><!-- --></A><H3>
closeQuietly</H3>
<PRE>
public static void <B>closeQuietly</B>(java.io.Closeable&nbsp;closeable)</PRE>
<DL>
<DD>Quietly (no exceptions) close Closable resource. In case of error it will
 be printed to <A HREF="../../../../org/apache/poi/util/IOUtils.html" title="class in org.apache.poi.util"><CODE>IOUtils</CODE></A> class logger.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>closeable</CODE> - resource to close</DL>
</DD>
</DL>
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